Fire-fighting apparatus



June 3, 1930. H. BURMEISTER 1,762,089

FIRE FIGHT-ING APPARATUS Filed Feb. 1o, 1928 1N VEA/TOR HANS EMME/STER Arm/'MY t Patented dunes, 3; I Y. y fr',

i UNITED STATESPATENTYoFFIcE HANS BURMEISTER, OF BERLIN, GERMANY, ASSIGNOR TO PYRENE-MINIMAX C`1BP0 y.

' RATION, Al CORPORATION OF DELAWARE FIRE-FIGHTING APPARATUS Application led EebruarylO, 1928, Serial No. 253,304, and in Germany February 11, 1927;

The presentinvention relates to irgeghterate for any reason the valve of that `ejecing devices and has for an object to'provide tor will close to prevent backflow; The upan improved apparatus of the type'in'which ward pivotal movement of the valves lgis suitable chemicals are mixed with water for limited by projecting shoulders 15, The flow 5 use in extinguishing iire. of water through the inlet band to the-spray; 50 The invention has been developed in-conc is kcontrolled 'by suitable valves d and e as nection with the production of apparatus will be well understood.` for generating iire foamand such an appa The foregoing description of a particular ratus will be described :tor the purpose of apparatus is illustrative merely and is not illustrating the principles involved, but it intended asdening the limits of the inven- 6l will be understood that the invention is not tion. limited to this particular structure. f l a Iclaim:

Y In the drawing forming a part hereo,- L'In apparatus for producingre foam, The figure is a central sectional'view ot in combination, a hopper for foam forming.

a foam generating apparatus embodying the powder, a mixing chamber, a plurality ofco principles of the invention.V l `ejectors arranged to draw'powder from the The generator shown for the purpose ot bottom 'of said hopper, mix it with water illustrating the invention comprises a hopand convey it to said mixing chamber and a` per o for foam Jforming chemicals and a mixvalve normally closing the outlet .of each ejecf V ing ychamber la formed inthe casing a,-to` tor and preventing back-How from the mix-'#65 gether with suitable ejectors arranged to ing chamber' to the ejector ybut varrangedto mixl the chemicals with water and convey* open automatically to permit discharge from Y the mixture to the' v.mixing chamber. As the ejector to the mixing chamberl substany shown, water is suppliedV through an inlet tiolly as described. y

b to a head g providingaplurality of nozzles 2. In apparatus for producing tire oamfffl which cooperate'with suitabletapered out-rv .incombinatiom a hopper for foam forming lets'Z to form ejectors.` The outlets Z are powder, a mixing chamber, a plurality of Vsupported in a casing ssecure'd to the hopper ejectors arranged to draw powder from the 1*. In operation the chemicalsin the hopper bottom of said hopper, mixed' with water and 1' are washed into the ejectors by water enconveyed to said mixing' chamber, means fore-75' tering through-,a suitable spray c at the top admitting water to the hopper to wash the j y of the hopper; The chemicalsfmay be suppowder 'from the hopper toward the ejectors,

plied kto the hopper rin any suitable mananda valve normally closing the outlet oi Vner.V I j' Y each ejector and preventing back-flow from LThe Vpresent invention provides means the 'mixing lchamber to the ejector but ar-so whereby any backflow from they mixing ranged to open automaticallyto permit dischamber lc Vinto the ejectors or ejector outlets charge from the ejector to the mixingcham` Zis prevented. As shown for the purpose of ber substantially as described. illustration, flap valves 14 are hinged to the 3. -In .apparatusr for producing tire foam,

40 outlets lin position to benormally closed but in combination, a hopper for foam formings j so arranged as to bel opened `readily bythe powder, a mixing chamber, a plurality or" stream of liquid, vor foam issuing from the ejectors at the bottom of said hopper and opf ejector. The valves vof the several ejectors erative to mix the foam ormingpowder andv v operate independently of .each other'wherewater and to convey the same to the mixing by in the event of one ejector ceasing to opchamber, means for admittingy water to saidDO January, 1928.

hopper to Wash the powder therein downwardly to the ejeotors, and a valve normally closing the outlet of earch ejector to prevent back-110W from the mixing chamber to the ejector but arranged to open automatically to permit discharge from the ejector to the mixing chamber, substantially as described. In testimony whereof, I have signed my name to this specification this 23d day of HANS BURMEISTER. 

